Starting device for explosive-engines.



no; 892,609; PATENTED JULY 7, 1908.

- L..S. NASH.

I STARTING DEVICE FOR EXPLOSIVB ENGINES.

APPLICATION FILED JULY 31. 1901.

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PATENTED JULY 7, 1908.

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L. s. NASH. I STARTING DEVICE FOR BXPLOSIVE ENGINES.

APPLIGATION FILED JULY 31.1907.

LAWRENCE b. NASH, OF DETROIT, MICHIGAN.

STARTING DEVICE FOB EXPLOSIVE-ENGINE S.

Specification of Letters Patent. I

Patented July 7, 1908.

Application filed. July 31, 1907. Serial No. 386,358.

To all whom it may concern:

Be it known that 1, LAWRENCE S. NASH, a citizen of the United States of America, re-

- siding at Detroit, in the county of Wayne v for explosive engines whereby a supply of yet compressed air is maintained automatica a constant pressure by the engine, and is admitted to act directly on the pistons when desired, through valve connections operated by one of the parts of the en ne The invent1on consists in t e matters here: inafter set forth, and more particularly pointed out in the appended claims.

.' In the drawings, Figure 1 is a view in side elevation of a multi-cylinder twocycle 'engine rovided with a starting device embodying -t e invention. Fig. 2 is a view in end elevation of the engine, and starting mechanism. Fig. 3 is a view in section on line Y A'-A of Fig. 2. Y

Referring to the drawings, 1 represents in outline the cylinders and frame of the engine, having a m' in r'i'aft 2 and a horizontal commutator shaft 3, driven in unison therewith through a eartrain 4 or the like.

A vertically. isposed air pump cylinder 5 ris secured at any convenient pomt on the engine basaabove and in line with the shaft 3.

. the pump to The gimp" cylinder is open at its lower end, is carried down and extended as a case for a piston rod 6 which operates a piston 7 through wrist pin and crank connection 8 with the shaft 3.

The piston rod is connected to the piston by a horizontal pin 9, secured in bosses 10 on the side wall of the head. An a ertured valve seat 11, referably centrally disposed, is formed in t. e piston head and is sufiiciently recessed at its upper end to readil retain aball or other closure 12, which sea s the aperture against downward passage'of air. A similar apertured valve seat 13 with downwardly acting ball closure 14 is formed --in the cylinder head 15, and a pressure pipe 16, screwed or otherwise secured to an outer nipple 17 in the head over the seat connects a pressure tank 18 of any suitable design, placed at any convenient point. A shutofi va ve 19 of any suitable construction is interposed between the tank and um cylinder. This piston is so adjusted in re ation to the cylinder head that the compression obtained in the cylinder at each stroke is equal to .that to be maintained in the tank, sothat after the latter is once filled, the balls, which arejin efi'ect check valves, do not 0 erate because of the balance pressure, and t e pump cylinder does not receive or force ina fresh charge until the pressureagain falls. f

IA lateral branchpipe 20 leads from the tank pipe to the compression end of the. two engine cylinders beyond the commutator and air pump, into which it opens through proper fittings 21 and valves-22. The latter are preferably secured in an axial plane of the commutator shaft. Their closures, prefer ably conical, and of the vertical lift type are operated by longitudinally reciprocable stems 24, passing through guide brackets 25 on the engine frame and are kept normally seated by spiral sprin s 26 or the like, in. compression between t e valve casings and suitable, adjustable stop collars 27 on" the shaft. A tappet 28 of any preferred form is secured in the lower end of each stem. The tappets may be intermittently operated by suitable cams 29:, that are longitudinally reciprocable on an extension 30 of the commutator shaft, rotatable in bearings which, as'a convenient detail of construction, may be in the tappet brackets 25.

A longitudinally reciprocable shifting rod.

31 is concentrically secured in the extensions 30 and is movably interlocked with the extension and earns by pins or studs 32 which engage obliqueslots 33 in the extension. A

spring 34 in compression between the extenslon and a hand knob 35 of the projecting end of the rod 31, normally holds the shifting rod projected with the cams out of en-. gagement with. the tappets. The oblique stud slots give the cams a part turn as they move them into engagement with the tappetswhen the rod is pushed in. In setting up the mechanism, the cams, slide rod, tap ets and slots are so disposed andtimed in re ation to the engine that there is an automatic selective action whereby ushing in the slide rods admits the inte ra charge to that cylinder only which is in t e ex ansion phase of its cycle, that is, in which t e piston is at or receding from the point of highest coin ression. Thereafter, the revolution of the engine autoorder until explosion of the regular charge matically operates the air valves in proper 1. Starting mechanism-for a multi -cylin- 1 der engine, comprising a pair of valves each adapted to admit compressed air to a cylinder of the engine, a cam shaft driven by the engine cams movable on the said shaft, adapt ed to operate said valves, a slide rod journaled in the shaft, oblique slots formed in the shaft, studs extending through the slots, connecting the slide rod and cams, and a spring on the slide rod, normally holding said cams disengaged with the valves.

2. Starting mechanism for a multi-cy'lin der engine, comprising a pair of valves each adapted to'admit compressed air to a cylinder of the engine, tappets. connected to the valves,-a cam shaft driven by the engine,

' cams movable thereon, adapted to operate the tappets in time with the engine, a slide rod concentrically secured longitudinally in the shaft, said shaft formed with oblique slots, studs engaging the slots and connecting the slide rod and cams, and a spring normally projecting the rod toward the end of the slots remote from the tappets.

3.. Starting mechanism for a multi-cylinder engine, comprisin an air pressure tank connected to two of t e engine cylinders, an air pump for theta'nk, a check valve opening from the pump to the tank, an air valve between each of said cylinders and the tank, cams on the pump shaft adapted to operate said valves, a slide rod longitudinally movable in the shaft said shaft having oblique slots, studs extending through the slots connecting the cams and the slide rod, and a spring adapted to normally hold the rod pro- 892, Seev jected and the cams disconnected with the valve.

p 4. Starting mechanism for a multi-cyhnder engine, comprising a pressure tank, an air pump therefor, a shaft arallel to the main shaft, driven in unisont erewith, and opera tively connected tothe pump, connections between the compression ends of two of the engine cylinders and the .tank, air valves therein, longitudinally reciprocable tappet rods transverse to the pump shaft sliding in guide brackets in which the ump shaft is 1n an axial aperture through the ump shaft,

ournaled, a slide rod longitudinally movable said shaft having slots formed 0 lique to its 7 axis, whose inner ends are in substantial alinement with the tappet rods, cams on the shaft secured to the slide rod by studs passing through the slots, and a spring between the rod, and shaft, adapted to normally hold said studs at the outer ends of said oblique slots.

5. In a multi-cylinder two-cycle engine,

provided with a commutator drive shaft rotating in unison with the main shaft, a ressure tank, anair pump for the tank .w ose piston is reciprocated by rod and crank connection with the co'mmutatorshaft, an extension of said shaft journaled in guide brackets on the engine, connections between i r the tank and two of the engine cylinders, an

air valve opening into each of said cylinders in said connections, tappet rods transverse to the shaft extension operating said valves, cams on said extension, a slide rod extending axially through the shaft extension, said extension having slots formed therein oblique to its axis, studs passing throu h the oblique slots connecting the cam-and s 'de rod and a spring between the rod and extension adapted to normally hold said rod and cams disengaged from the tappets;

In testimony whereof I aflix in presence of two witnesses.

LAWRENCE s. NASH.

my signature Witnesses:

' C. R. STIcKNEY,

OTTo F. BARTHEL. 

